The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | -2 |
| 3 | 123 |
| 4 | -3364 |
| 5 | 307445 |
| 6 | -27693606 |
| 7 | 4225124911 |
| 8 | -763609828808 |
| 9 | 186062503278825 |
| 10 | -54699231827563210 |
| 11 | 19846874921743244771 |
| 12 | -8537442340155261028332 |
| 13 | 4342042121637684282920413 |
[0,1,-2,123,-3364,307445,-27693606,4225124911, -763609828808,186062503278825,-54699231827563210, 19846874921743244771,-8537442340155261028332, 4342042121637684282920413] |